Method and apparatus for shifting a doctor blade
AssigneeFischer & Krecke GmbH & Co.
InventorsWilfried Kolbe, Bodo Steinmeier, Andreas Kückelmann, Klaus Schirrich, Ralf Mulch
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Abstract
A method for shifting a doctor blade in its longitudinal direction, the doctor blade being set against a cylinder of a printing machine, wherein the shift movement of the doctor blade is such that, for most of the time of the print operation, the shift velocity of the doctor blade is in a range from 0 to 0.1 m/s, and a printing machine having a doctor blade assembly, including a doctor blade arranged to be set against a cylinder, and a shift mechanism for shifting the doctor blade in its longitudinal direction, such that the shift mechanism is adapted to execute the method.
Claims15
A method for shifting a doctor blade in a longitudinal direction thereof, the doctor blade being set against a cylinder of a rotary printing machine of a type in which a printed web is wound on a coil which must be periodically changed, the method comprising the steps of:
- shifting movement of the doctor blade such that, for most of the time of a print operation, a shift velocity of the doctor blade is in a range from 0 to 0.1 m/s,
- dividing the shift movement of the doctor blade, in terms of time, into motion preiods and rest periods such that, during the printing operation, the duration of the rest periods is predominant, and
- arranging the motion periods in operation phases in which a waste portion of the web is being printed.
A method for shifting a doctor blade in a longitudinal direction thereof, the doctor blade being set against a cylinder of a printing machine, comprising the steps of:
- shifting movement of the doctor blade such that, for most of the time of a print operation, a shift velocity of the doctor blade is in a range from 0 to 0.1 m/s.
- superposing a vibration movement with a frequency of at least 1 Hz to the shift movement, and
- performing the vibration movement in the longitudinal direction of the doctor blade.
Dependencies are inferred from the claim text.